Only ever due to human ineptitude or intentional malfeasance, has a robot killed a human. Never of their own free will.
Life itself is the leading cause of death.
Life itself is the leading cause of death.
It only takes a volcano, earthquake, tsunami, viruses (which are not living organisms) and other such events, for life not to be a leading cause of death in a region for a good while.
And let's not mention meteors...
? -> volcano -> ?
No life preceding death, so no death.
Volcano and meteors are variables, while life preceding death is a constant.